We won't pretend to be experts in NAND fabrication so we'll keep this short. Toshiba just showed their 15-nm processes which allows for the production of 100Gbit NAND flash chips in 4 years time. That is, if they can develop the technology for manufacturing -- no easy task. Compare that to those 16Gbit chips manufactured from 50-nm and 52-nm processes due for release next year, and you'll understand why physicists are in such a tizzy over the announcement.